Added VGA grayscale and choose screen type

VGA render can transform to grayscale and applying color.
Green, amber and white.

src/VIDEO/vid_svga_render.c

@@ -17,6 +17,7 @@
  */
 
 #include <stdio.h>
+#include <math.h>
 #include "../ibm.h"
 #include "../mem.h"
 #include "video.h"
@@ -25,21 +26,69 @@
 
 
 int invert_display = 0;
-
+int video_grayscale = 0;
 
 uint32_t svga_color_transform(uint32_t color)
 {
 	uint32_t temp = 0;
+	temp = color;
+	if (video_grayscale != 0)
+	{
+		temp = ((77 * (color & 0xff0000)) >> 24) + ((150 * (color & 0xff00)) >> 16) + ((29 * (color & 0xff)) >> 8);
+		if (temp > 0xff)
+			temp = 0xff;
+
+		float temp_r = 0;
+		float temp_g = 0;
+		float temp_b = 0;
+		temp_r = temp_g = temp_b = ((float)temp) / 256;
+		switch (video_grayscale)
+		{
+			case 2:
+				temp_r = pow(temp_r, 0.6);
+				temp_g = 0.9 * pow(temp_g, 2);
+				temp_b = 0.2 * pow(temp_b, 6);
+				break;
+			case 3:
+				temp_r = 0.225 * pow(temp_r, 4);
+				temp_g = pow(temp_g, 0.75);
+				temp_b = 0.375 * pow(temp_b, 2);
+				break;
+			case 4:
+				temp_r = pow(temp_r, 1.05);
+				temp_g = 0.99 * temp_g;
+				temp_b = 0.925 * pow(temp_b, 0.9);
+				break;
+		}
+		if (temp_r >= 1)
+			temp = 0xff0000;
+		else if (temp_r <= 0)
+			temp = 0x000000;
+		else
+			temp = (int)(temp_r * 256) << 16;
+
+		if (temp_g >= 1)
+			temp |= 0x00ff00;
+		else if (temp_g <= 0)
+			temp &= 0xff00ff;
+		else
+			temp = temp + ((int)(temp_g * 256) << 8);
+
+		if (temp_b >= 1)
+			temp |= 0x0000ff;
+		else if (temp_b <= 0)
+			temp &= 0xffff00;
+		else
+			temp = temp + (int)(temp_b * 256);
+
+		color = temp;
+	}
 	if (invert_display)
 	{
-		temp |= (0xff - (color & 0xff));
+		temp = (0xff - (color & 0xff));
 		temp |= (0xff00 - (color & 0xff00));
 		temp |= (0xff0000 - (color & 0xff0000));
 	}
-	else
-	{
-		temp = color;
-	}
 	return temp;
 }
 

src/WIN/86Box.rc

@@ -46,7 +46,7 @@ BEGIN
     BEGIN
         MENUITEM "&Hard Reset",                 IDM_ACTION_HRESET
         MENUITEM "&Ctrl+Alt+Del\tCtrl+F12",     IDM_ACTION_RESET_CAD
-		MENUITEM "&Ctrl+Alt+Esc",				IDM_ACTION_CTRL_ALT_ESC
+		MENUITEM "Ctrl+Alt+&Esc",				IDM_ACTION_CTRL_ALT_ESC
         MENUITEM SEPARATOR
         MENUITEM "E&xit",                       IDM_ACTION_EXIT
     END
@@ -81,6 +81,14 @@ BEGIN
         BEGIN
             MENUITEM "&Inverted VGA monitor",       IDM_VID_INVERT
             MENUITEM "E&GA/(S)VGA overscan",        IDM_VID_OVERSCAN
+        	POPUP "VGA Screen &type"
+    		BEGIN
+    			MENUITEM "RGB &Color",				IDM_VID_GRAY_RGB
+    			MENUITEM "&RGB Grayscale",			IDM_VID_GRAY_MONO
+    			MENUITEM "&Amber monitor",			IDM_VID_GRAY_AMBER
+    			MENUITEM "&Green monitor",			IDM_VID_GRAY_GREEN
+    			MENUITEM "&White monitor",			IDM_VID_GRAY_WHITE
+    		END
         END
         MENUITEM SEPARATOR
         MENUITEM "F&orce 4:3 display ratio",    IDM_VID_FORCE43

src/WIN/resource.h

@@ -410,6 +410,11 @@
 #define IDM_VID_OVERSCAN	40076
 #define IDM_VID_INVERT		40079
 #define IDM_VID_CGACON		40080
+#define IDM_VID_GRAY_RGB	40090
+#define IDM_VID_GRAY_MONO	40091
+#define IDM_VID_GRAY_AMBER	40092
+#define IDM_VID_GRAY_GREEN	40093
+#define IDM_VID_GRAY_WHITE	40094
 
 #define IDM_LOG_BREAKPOINT	51201
 #define IDM_DUMP_VRAM		51202	// should be an Action

src/WIN/win.c

@@ -1532,6 +1532,7 @@ int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpsz
 	CheckMenuItem(menu, IDM_VID_SCALE_1X + scale, MF_CHECKED);
 
 	CheckMenuItem(menu, IDM_VID_CGACON, vid_cga_contrast ? MF_CHECKED : MF_UNCHECKED);
+	CheckMenuItem(menu, IDM_VID_GRAY_RGB + video_grayscale, MF_CHECKED);
 
         d=romset;
         for (c=0;c<ROM_MAX;c++)
@@ -1970,6 +1971,18 @@ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM
 					saveconfig();
 					break;
 
+				case IDM_VID_GRAY_RGB:
+				case IDM_VID_GRAY_MONO:
+				case IDM_VID_GRAY_AMBER:
+				case IDM_VID_GRAY_GREEN:
+				case IDM_VID_GRAY_WHITE:
+					CheckMenuItem(hmenu, IDM_VID_GRAY_RGB + video_grayscale, MF_UNCHECKED);
+					video_grayscale = LOWORD(wParam) - IDM_VID_GRAY_RGB;
+					CheckMenuItem(hmenu, IDM_VID_GRAY_RGB + video_grayscale, MF_CHECKED);
+					saveconfig();
+					device_force_redraw();
+					break;
+
 #ifdef ENABLE_LOG_TOGGLES
 #ifdef ENABLE_BUSLOGIC_LOG
 				case IDM_LOG_BUSLOGIC:

src/config.c

@@ -804,7 +804,7 @@ static void loadconfig_general(void)
 	}
 	enable_overscan = !!config_get_int(cat, "enable_overscan", 0);
 	vid_cga_contrast = !!config_get_int(cat, "vid_cga_contrast", 0);
-
+	video_grayscale = config_get_int(cat, "video_grayscale", 0);
 
         window_remember = config_get_int(cat, "window_remember", 0);
 
@@ -1801,6 +1801,15 @@ static void saveconfig_general(void)
 	        config_set_int(cat, "vid_cga_contrast", vid_cga_contrast);
 	}
 
+	if (video_grayscale == 0)
+	{
+		config_delete_var(cat, "video_grayscale");
+	}
+	else
+	{
+	        config_set_int(cat, "video_grayscale", video_grayscale);
+	}
+
 
 	if (window_remember)
 	{

src/ibm.h

@@ -737,6 +737,7 @@ extern int serial_enabled[2];
 extern int lpt_enabled, bugger_enabled;
 
 extern int invert_display;
+extern int video_grayscale;
 
 uint32_t svga_color_transform(uint32_t color);